Bill of Material - 3: Item Number
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
Each item on the Bill of Materials is given a number. In the aerospace and defense industries, even a blueprint of a single simple part will have a B/M listing a single item, and will show the material stock from which the part is to be made. An example of a one item B/M is shown in the image bellow. This differs from commercial practice, where a blueprint of a single part will usually show the material somewhere in the title block. The B/M will always be found, however, on commercial blueprints that contain multiple parts. On a large assembly blueprint there could be a hundred items on the B/M.

Each item number on a B/M is unique for that part. For example, if the blueprint shows two identical parts, both will have the same item number and part number. Another example: if twenty ¼ x 1 inches long screws are needed on an assembly in different locations, all ¼ x 1- inch screws will have the same item number.

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label: BOM. bill of material, item numbers, key numbers, material specifications, assembly blueprint, subassembly, dash numbers and vehicles